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Type: Journal article
Title: Cooling history of Atlantis Bank oceanic core complex: Evidence for hydrothermal activity 2.6 Ma off axis
Author: Schwartz, J.
John, B.
Cheadle, M.
Reiners, P.
Baines, G.
Citation: G3: Geochemistry, Geophysics, Geosystems: an electronic journal of the earth sciences, 2009; 10(8):8020-8020
Publisher: American Geophysical Union
Issue Date: 2009
ISSN: 1525-2027
Statement of
Joshua J. Schwartz, Barbara E. John, Michael J. Cheadle, Peter W. Reiners and A. Graham Baines
Abstract: We report 26 (U-Th)/He zircon ages from Atlantis Bank, Southwest Indian Ridge, which constrain time scales and rates of lower crustal cooling in ultraslow spreading oceanic crust in this setting. Samples from the detachment fault surface indicate that denuded oceanic crust cooled rapidly (<1 Ma), yielding cooling rates >1200°C/Ma, consistent with existing models for the cooling of oceanic crust. (U-Th)/He zircon ages from samples collected along N–S and E–W trending faults scarps record young ages inconsistent with standard cooling models for lower oceanic crust. These samples have a mean (U-Th)/He zircon age 2.6 Ma younger than their corresponding igneous crystallization ages and record cooling through 200°C well outside the rift valley. Similar anomalously young ages are recorded by zircon, sphene, and apatite fission track data from ODP Hole 735B. We interpret these young ages as recording an off-axis thermal/heating event associated with localized high-temperature (>300°C) hydrothermal fluid flow resulting from underplated mafic magmas.
DOI: 10.1029/2009GC002466
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